Why is my Verizon Wireless bill so high?

I just received my first bill from Verizon Wireless on my new smart phone, the Droid Incredible. I found the bill very high.. and most of my bill was Megabyte Usage and Data, which was the priciest, can someone explain what this is and what I did? And what I should do to get my bill to be lower the next time? I appreciate all answers, thanks. (:
 
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